Extended the proposal POST route to accept file upload (#62)

[benedictfred]

Description

This pull request adds support for uploading and displaying supporting documents (PDF, DOC, DOCX) with proposals. It updates the backend to handle file uploads, validates file types and extensions, saves files to disk, and updates the frontend to allow users to upload documents when creating proposals. Additionally, the proposal details page now displays a download/view link for the uploaded document if present.

Changes Made

Backend: File upload and validation

• Updated the POST handler in DevoteApp/app/api/proposals/route.ts to accept multipart/form-data, validate file type and extension, save the file to a new directory under public/uploads/proposals, and store the file path in the proposal document.

Frontend: Proposal creation modal

• Modified CreateProposalModal to allow users to upload PDF, DOC, or DOCX files, show the selected file name, and handle form submission using FormData. The modal now disables the submit button and shows a loading state during submission.

Frontend: Proposal display

• Updated the proposal voting page to display a card with a download/view link for the supporting document if one is attached to the proposal.

Type definition update

• Added an optional file field to the ProposalPublic interface to reflect the new backend changes.

Linked Issue

This PR closes issue #62

Video Proof

• Uploading of file
  Screencast from 2025-09-10 23-08-33.webm

• Viewing / downloading the file
  Screencast from 2025-09-10 23-09-49.webm

Additional Comments

In production, we should use storage services like cloudinary or AWS S3 to manage the file uploads and then save the URL to the database.

@pmora3003
Please review and if there are changes to make, let me know. Thanks 🙏.

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